Basic Graphic Programming in C++

Creating a C/C++ Code Formatting tool with help of Clang tools

Last Updated : 16 Jul, 2020

Today we are going to discuss formatting files in the user’s workspace by their extension. For this we are going to make use of Clang’s format tools.

Prerequisites:

Linux Machine
Python
Clang Tool

Setup:

Install Python using the following command:
```
sudo apt-get install python
```
Install Clang Format Tools
```
sudo apt-get install clang-format-3.5
```

Create a python file named format-code.py at any location where you have read and write permissions. In this example we are going to create it in /home/user/. It shall contain the following code:

# Python program to format C/C++ files using clang-format 
import os 
  
# File Extension filter. You can add new extension 
cpp_extensions = (".cxx",".cpp",".c", ".hxx", ".hh", ".cc", ".hpp") 
  
# Set the current working directory for scanning c/c++ sources (including 
# header files) and apply the clang formatting 
# Please note "-style" is for standard style options 
# and "-i" is in-place editing 
for root, dirs, files in os.walk(os.getcwd()): 
    for file in files: 
        if file.endswith(cpp_extensions): 
            os.system("clang-format-3.5 -i -style=file " + root + "/" + file) 

Create format specification file and copy it to project’s top level directory , e.g., /home/user/myproject/
1. Create formatting file (in example, we are creating google coding style tool)
```
clang-format-3.5 -style=google -dump-config > .clang-format 
```
2. Copy it to project’s directory i.e., it’s location becomes: /home/user/myproject/.clang-format

How to use it?

Navigate to the directory whose files you want to format, e.g.,
```
cd  /home/user/myproject/c-source/
```
Run the format-code file that you created earlier
```
python /home/user/format-code.py
```

This shall format all the files in our source directory with the extension same as that mentioned in the code.

Basic Graphic Programming in C++

N

Nitin Deokate

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